no-undef should apply on assigning a property to an undefined variable

What rule do you want to change? no-undef

Does this change cause the rule to produce more or fewer warnings? more

How will the change be implemented? (New option, new default behavior, etc.)? maybe a new option

Please provide some example code that this change will affect: The following assignment should not be allowed if the rule is active, assuming Text is an undefined variable.

Text.propTypes = { a: 'b' }

What does the rule currently do for this code? It does not apply on this case and can potentially break builds.

What will the rule do after it’s changed? It will warn or error if there is an property-assignment to an undefined variable.

Are you willing to submit a pull request to implement this change? Yes

[aladdin-add]

Is Text an allowed browser global?

seems it was true: https://github.com/sindresorhus/globals/blob/8f022be1112cc0964ca77947a4db5417056188c8/globals.json#L874

so it was working as expected. 😃

[g-plane]

I can’t reproduce: https://eslint.org/demo/#eyJ0ZXh0IjoiVGV4dC5wcm9wVHlwZXMgPSB7IGE6ICdiJyB9Iiwib3B0aW9ucyI6eyJwYXJzZXJPcHRpb25zIjp7ImVjbWFWZXJzaW9uIjo5LCJzb3VyY2VUeXBlIjoibW9kdWxlIiwiZWNtYUZlYXR1cmVzIjp7fX0sInJ1bGVzIjp7Im5vLXVuZGVmIjoyfSwiZW52Ijp7fX19